BIN1 membrane curvature sensing and generation show autoinhibition regulated by downstream ligands and PI(4,5)P2.

ABSTRACT: In striated muscles, invaginations from the plasma membrane, termed transverse tubules (T-tubule), function in the excitation-contraction coupling machinery. BIN1 (isoform8) plays a critical role in the biogenesis of T-tubules. BIN1 contains an N-terminal BAR domain to sense and induce membrane curvature, an isoform8-specific polybasic motif (exon10) as the phosphoinositide binding module and a C-terminal Src homology 3 (SH3) domain for the recruitment of downstream proteins such as dynamin 2. Previous studies of N-BAR domains focused on elucidating mechanisms of membrane curvature sensing and generation (MC-S&G). Less is known about how MC-S&G is regulated. We found that the SH3 domain binds to the exon10 motif more strongly compared to the proline-rich domain (PRD) of dynamin 2. Furtherm

SUBMITTER: Wu T 

PROVIDER: S-EPMC4245986 | biostudies-literature | 2014 Nov

REPOSITORIES: biostudies-literature